Keithley 3321 Operator's Manual page 19

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SECTION3
Operation
Front Panel Indicators:
BUSY-This indicator lights when a measurement is be-
ing made. This indicator is off while in OPEN or SHORT.
REMOTE -This indicator is on when the GPIB interface
is in the remote state. While in remote, the front panel
controls are disabled.
FREQ (Hz) -
Denotes the frequency (120H2, lkHz,
1OkHz or 1OOkHz) that was selected using the FREQ keys.
CKT MODE - Denotes the equivalent circuit that was
selected using the CKT MODE keys.
AUTO Automatic selection mode; SER or PAR auto-
matically selected.
SER Series equivalent circuit.
PAR
Parallel equivalent circuit.
Note: CKT selections only affect readings on m DIS-
PLAY.
LEVEL (OPEN)- Denotes the level of the measurement
signal that was selected using the LEVEL keys.
50m 50mV rms signal level. Basic accuracy is lowered
using this level.
1
Standard 1V rms signal level.
The indicated signal level is the voltage applied to the
output while under a "no load" condition. The output
impedance of the signal source is approximately 1OOfi.
When connecting the signal to a device that has an im-
pedance of less than lkS& loading will cause the signal
level to drop below the indicated voltage level.
Front Panel Controls:
POWER ON-OFF
The "in" position turns power on and the "out" position
turns power off. After turning power off, wait at least
three seconds before turning it back on.
BIAS ON Key
Pressing this key enables the internal 2V bias power sup-
ply. Pressing the key a second time disables the bias sup-
ply. With the rear panel BIAS INT/EXT switch set to the
EXT position, the BIAS ON key will instead control the
externally applied bias supply.
NOTE
The bias supply can only be enabled with the
C (capacitance) function selected and AUTO
function disabled.
FREQ (Hz) Keys:
These keys are used to select the frequency of the meas-
urement signal. The enabled annunciator denotes which
frequency is selected.
120
- Pressing this key sets the measurement frequency
to 120Hz.
lk - Pressing this key sets the measurement frequency
to 1kHz.
10k -Pressing this key sets the measurement frequency
to 10kHz.
100k -
Pressing this key sets the measurement fre-
quency to 1 OOkHz.
m DISPLAY Keys:
The following keys are used to select the measurement
function. The reading for the selected function is shown
on them DISPLAY. The default function parameter (Q,
D or 0) for the selected function is automatically selected
and shown on the m DISPLAY.
L - Pressing this key selects the inductance (L) function
and displays the reading in henries (H). The selected de-
fault function parameter is Q.
C-Pressing this key selects the capacitance (C) function
and displays the reading in farads (F). The selected de-
fault function parameter is D.
121-e--
Pressing this key selects the impedance (Z)
function and displays the reading in ohms (a). Note that
this function is used to measure resistance. The phase an-
le (0)
I5
for the impedance measurement is shown on the
B
DISPLAY.
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