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.
