Warner PC-505B - Instrument Checkout Procedures; RMS Noise and Im Output Checks; Junction Zero and Internal DC Voltage Command Verification

PC-505B Manual, Rev. 201013
Warner Instruments
A Harvard Apparatus Company
21
RMS noise checkout
1. Set the METER SELECT switch to the RMS noise position.
2. Check for a noise reading on the METER at or below 0.038 pA. If the value reported is
high, then relocate or adjust the headstage and shielding to minimize noise inputs.
I
m
output checkout
1. Set scope voltage base to 0.5 V/div.
2. Set GAIN to 100 mV/pA
3. Set FILTER to 1 kHz.
4. Check that the METER reads  0 pA.
5. Switch PROBE RESISTER toggle from high to low. Verify that the METER reading stays
within  2 pA
6. Switch PROBE RESISTER toggle from low to high.
7. Check that oscilloscope reads 0.0  0.5 pA (i.e. within 1 div of zero on oscilloscope for
this setting.)
8. Return amplifier to initial settings.
Junction zero checkout
1. Set the METER SELECTOR switch to the Junction Zero
2. Adjust the JUNCTION ZERO control (COMMANDS block) until the meter reading is 10 mV.
3. Verify that V
m
and  V
c
on the METER SELECTOR switch give the same meter reading as
Junction Zero (10 mV).
4. Set METER SELECT to Vc+h IN and check that the METER reads zero.
5. Place METER SELECT switch in Junction Zero position.
6. Adjust the JUNCTION ZERO control to its maximum setting (fully CW).
7. Check that the METER reads  120 mV for Junction Zero, V
m
, and  V
c
METER SELECT
settings.
8. Adjust the JUNCTION ZERO control to its minimum setting (fully CCW).
9. Check that METER reads  120 mV for Junction Zero, V
m
, and  V
c
METER SELECT settings.
10. Set METER SELECT to Junction Zero.
11. Adjust JUNCTION ZERO until METER reads zero.
12. Return amplifier to initial settings.
Internal DC voltage command checkout
1. Connect oscilloscope to V
c
x10 BNC on front panel.
2. Set scope to 50 mV/div .
3. Set the METER SELECT switch to the Junction Zero setting and adjust meter reading to 10
mV with the JUNCTION ZERO control.