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50MHz DIFFERENTIAL PROBE
USER'S MANUAL (SI-51) |
| This probe is in compliance with IEC-61010-031 CAT I or CAT II, Pollution Degree 2. |
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1. Safety Terms and Symbols |
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Terms appear in this manual: |
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WARNING. Warning statements identify conditions or practice that could result in injury or loss life.
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CAUTION. Caution statements identify conditions or practice that could result in damage to this product or other property.
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Symbols appear on the product: |
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 Danger
High Voltage |
 Protective
(Earth) Terminal |
Attention
Refer to Manual |
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2. General Safety Summary | |
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Review the following safety precautions to avoid injury and prevent damage to this probe or any products that connected to it. |
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Observe Maximum Working Voltage |
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To avoid any injury, do not use the probe under following conditions that the voltage between either input lead or earth is above 600Vrms CAT II. This voltage rating applies to 1/100 setting.
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Must be Grounded |
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This probe is grounded with the shell of BNC
connector and an auxiliary grounding terminal, through the grounding
conductor of the power cord of the measurement instrument.
Before making connections to the input leads of this probe, ensure
that the output BNC connector is attached to the BNC connector
of the measurement instrument and the auxiliary grounding terminal
is connected to a proper ground, while the measurement instrument
is properly grounded.
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Use Fused Test Prods if Necessary |
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If this probe is intended to use for measurements in circuits of INSTALLATION CATEGORY III, it should incorporate with fused test prods. |
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Do Not Operate Without Covers |
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To avoid electric shock or fire hazard, do not operate this probe with covers removed. |
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Do Not Operate in Wet/Damp Conditions |
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To avoid electric shock, do not operate this probe in wet of damp conditions. |
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Do Not Operate in Explosive Atmosphere |
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To avoid injury or fire hazard, do not operate this probe in an explosive atmosphere. |
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Avoid Exposed circuitry |
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To avoid injury, remove jewelry such as rings, watches, and other metallic objects. Do not touch exposed connections and components when power is present. |
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Use Proper Power Source |
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To ensure this probe function well, use four AA cells or 6VDC/90mA or regulated 9VDC/70mA mains adaptor or power lead. Do not operate this probe from a power source that applies more than the voltage specified.
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Do Not Operated With Suspected Failures |
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If you suspect there is damage to this probe, have it inspected by qualified service personnel. |
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3. Description |
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By enabling conventional oscilloscopes to display and measure in-circuit waveforms that are referenced to high common mode voltages, the differential probe extends the measurement capability of oscilloscopes in electronic power converters, inverters, motor speed controls, switch mode power supplies, and many other applications. |
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4. Installation |
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a. Simply plug-in the BNC output connector to
the vertical input of a general purposed oscilloscope or other
measurement instrument, and connects the auxiliary grounding terminal
to a proper ground. The measurement instrument must have a ground
referenced.
b. Connect an appropriate power source to this probe and then turn it on.
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WARNING. To protect against electric shock, use only the accessory supplied with this differential probe.
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c. Using the appropriate probe accessories, connect
the inputs to the circuits under measurement.
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CAUTION. This probe is to carry out differential
measurement between two points on the circuit under measurement.This
probe is not for electrically insulating the circuit under
measurement and the measuring instrument.
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5. Appearance |
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The differential probe looks as follows.
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| a. Output Cable
: The BNC output connector and an
auxiliary grounding terminal are connected to the oscilloscope.
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| b. Removable Battery Pack (optional): 4 x
AA cells. |
| c. Power Source
Connector:
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This connector can be connected to the following
sources: |
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- Mains adaptor (6VDC/90mA or 9VDC/70mA)
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- Removable battery pack (4 x AA cells) |
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- Power leads |
| d. Power Supply. |
| e. Probe Body. |
| f. The input leads of the differential
probe. |
| g. Sprung Hooks: The sprung hooks
are connected safely to test points in circuits. |
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6. Power Leads |
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Threo types of power leads are offered; |
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a. Adaptor-Lemo Lead®;: For the oscilloscope
whose power connector is Lemo® connector. |
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b. Adaptor-Probus Lead®: For the oscilloscope
whose power connector is Probus® connector.
c. USB Power Cord: For the oscilloscope which offers USB connector. |
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7. Removable Battery Pack |
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The following figure illustrates
the operation of the removable battery pack; |
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8. Specifications
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| Bandwidth |
DC to 50MHz (-3dB) |
| Attenuation |
1/100 |
| Accuracy |
+/-1% |
| Rise Time |
< 7ns |
| Input Impedance |
4Mohm//7pF each side to ground |
| Input Voltage* |
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| - Category |
CAT II |
| - Differential
Range |
+/- 700V(DC + Peak AC) or
600Vrms |
| - Common
Mode Range |
+/-1400V(DC + Peak
AC) or 600Vrms |
- Absolute Max. Voltage
(Differential or Common Mode) |
+/- 1400V(DC+PeakAC) or
600 Vrms CAT II |
| Output |
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| - Swing (into 5kohm load) |
+/- 7V |
| - Offset
(typical) |
<+/- 1mV |
| - Noise (typical) |
0.3mVrms |
| - Source
Impedance (typical) |
50ohm (for using 1M ohm system oscilloscope) |
| CMRR (typical) |
-90dB@60Hz; -55dB@1MHz |
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Power Requirements* |
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Power Requirements**(Three options of power sources)
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Mains adaptor (6VDC/90mA or 9VDC/70mA) Removable battery pack (4xAA cells) power leads |
| Optional Extension Plugs for Mains Adaptor |
| - Input |
One jack of 1A current rating |
| - Output |
Three plugs of 1A current rating. |
| Ambient Operating Temperature |
-10 to 40 degree centigrade |
| Ambient Storage Temperature |
-30 to 70 degree centigrade |
| Ambient Operating Humidity |
25 to 85% RH |
| Ambient Storage Humidity |
25 to 85% RH |
| Length of BNC Cable |
125cm |
| Length of Input Leads |
50cm |
| Weight |
300gms |
| Dimensions (LxWxH) |
111mm x 22mm x 14mm |
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*Voltage limit is the lesser of the DC+Peak AC and RMS values.
* a. The supplied voltage must be less than 16V and greater than 3.3V, otherwise the probe could be damaged or can¡¦t be operated properly.
b.For wrong polarity of power sources, a built-in circuit will protect the probe and no danger or damage will occur.
c.When the voltage of the cells become too low, the power indicator on the panel will dim and then distinguish.
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9. Derating Curve |
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The derating curve of the absolute maximum
input voltage is shown as follows;
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10. Inspection Procedure |
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a. Connect the BNC output connector to the
vertical input of a general purposed oscilloscope. |
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b. Connect an appropriate power source to
this probe and then turn it on. |
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c. Set the oscilloscope input coupling to DC and the 1V/div. Center the trace on the display. |
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d. Connect the sprung hooks of the probe to power lines. |
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e. Then, a 50Hz/60Hz sine-wave of proper amplitude will
be displayed on the screen of the oscilloscope and this means
the probe is working properly. |
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11. Cleaning |
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Use a soft cloth to clean the dirt. Prevent damage to probe. |
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a. Avoid immersing the probe. |
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b. Avoid using abrasive cleaners. |
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c. Avoid using chemicals contains benzene or similar solvents. |
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 Sapphire
Instruments Co.,Ltd. 
16F, 866-9, Jung-Jeng Rd., Jung-Ho City, 235 Taipei County, Taiwan, ROC
TEL: 886-2-22250572 (Rep.) FAX: 886-2-22253412
Email : tina@sapphire.com.tw Web Site : www.sapphire.com.tw
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