User Manual

Adjustment Proc
edures
Gain
1. Setup the equipment as shown in following illustration:
a. Remove the BNC to probe tip adaptor from the probe input. Insert the Y-lead adaptor into the probe tip.
b. With MicroCKT test tip, connect the red lead to the power s upply positive terminal, and the black lead to the power
supply negative terminal.
c. With MicroCKT test tip, connect a ground lead from the probe case ground to the negative terminal of the power
supply.
d. Connect a second DMM to a pair of banana leads from the power supply outputs.
2. Se t the DMM monitoring the output to DC volts, up to the 2 volt range.
3. Se t the DMM monitoring the input to the 2 or 3 volt range. Keep averaging turned on, if necessary.
4. Set the probe to ÷ 5 attenuation, 5 MHz bandwidth, DC reject off.
5. Adjust the power supply to output about 700 mV
.
6. Adjust the ÷ 5 Gain adjustment until the DMM output reads 1/5 of the same voltage (≈140 mV) as the DM monitoring
the input within ± 5 mV.
7. Change the probe attenuation to ÷ 50.
8. Change the DMM monitoring the input up to the 20 volt range.
P6250 & P6251 Technical Reference 45