HP 3326A Operating And Reference Manual page 64

"
-
Cahbrat~on and
Self Test
A-EYT
9
CAL IN
@
ii-10 VOOI
8-EXT
4
CA'i lV4
IMULTI
6
REF IN
0
i ! ~ , O VPP,
External Calibration
In the 2 PHASE mode, external calibration enables the HP 3326A to sense phase at
an external reference point and calibrates the channel B phase with respect to chan-
nel A phase. Phase is sensed through the rear panel A-EXT
4
CAL IN and B-EXT
4
CAL
INIMULTI Q REF IN connectors. The external calibration inputs require an input range
from 3 to 10 volts peak-to-peak over the frequency range of 1 kHz to 13.1 MHz. Figure
1-27 illustrates a typical external phase calibration circuit. Amplitude, dc offset, and
internal modulation are calibrated with internal references.
HP-IB Example:
"CMD2"
or
"CMD EXT"