PC-505B Manual, Rev. 201013
Warner
Instruments
A Harvard Apparatus Company
23
13.
Set oscilloscope to 5 mV/div.
14.
Verify that
METER
reads
1 mV
and that oscilloscope reads 10 mV (2 div at these settings).
15.
Return amplifier to initial settings.
Internal AC voltage command checkout
1.
Set
COMMAND SELECT
(
COMMANDS
block) to
internal command.
2.
Set
COMMAND SENSITIVITY
to
x0.1
3.
Set
COMMAND SENSITIVITY
toggle to
on.
4.
Connect V
c
x10 output BNC to oscilloscope.
5.
Set oscilloscope voltage base to 0.5 V/div and time base to 5 ms/div.
6.
Verify that oscilloscope displays appropriate square wave (1 V p
–
p at line local frequency
of 50 or 60 Hz).
7.
Return amplifier and oscilloscope to initial settings.
Auto Zero control checkout
1.
Disconnect voltage source from
COMMAND IN
BNC.
2.
Connect model cell to headstage in
patch mode
.
3.
Set
METER
SELECT
to
I
m.
4.
Set
PROBE RESISTER
to
high
5.
Set
COMMAND SENSITIVITY
toggle to
off.
6.
Set
COMMAND SELECT
(
COMMANDS
block) to
external command
.
7.
Use
JUNCTION ZERO
control to set I
m
output on
METER
to
+10 pA.
8.
Switch
AUTO ZERO
on
and press
AUTO ZERO BUTTON
until meter reads
zero.
9.
Switch
AUTO ZERO
off
.
10.
Re
–
zero I
m
output using
manual
JUNCTION ZERO
control.
11.
Return amplifier to initial settings.
Vc commands checkout
1.
Connect model cell to headstage in
patch mode
.
2.
Connect I
m
output BNC to oscilloscope.
3.
Set oscilloscope to 1 V/div.
4.
Set
METER
to
I
m
.
5.
Verify
PROBE RESISTER
is set to
high.
6.
Set
COMMAND SELECT
to
external command.
7.
Set
COMMAND SENSITIVITY
toggle to
off
.
8.
Set
VOLTAGE HOLD
to
positive (+).
9.
Use
VOLTAGE HOLD
to set I
m
output to
+10 pA
on
METER
(positive hold adjustment should
give positive current output).
