HP 3326A Operating And Reference Manual page 71

Marker 1 Z-Blank 1 X-Drlve
Outputs
The Z-BLANK OUTput drops low at the start of sweep and remains low until the end
of a sweep. At the end of a sweep, Z-BLANK OUT goes to a high level and remains
high until another sweep segment is initiated. The Z-BLANK OUT connector is located
on the rear panel and the output is TTL compatible. The Z-BLANK OUT low level is capa-
ble of sinking current from a positive voltage source through a pen-lift circuit or other
device. Figure 1-32 illustrates a typical circuit for connecting Z-BLANK OUT to an os-
cilloscope. When used as an input, the maximum Z-BLANK OUT ratings are:
Maximum current sink:
100
mA
Allowable voltage range: 0 to
+
42 V dc
Z-BLANK OUT drops low at the start of sweep and remains low until the end of a sweep.
At the end of a sweep, the Z-BLANK OUT goes to a high level and remains high while
the frequency is reset to 'the start frequency.
Triangle Linear
Z-BLANK OUT drops low during the sweep from the start frequency to the stop fre-
quency, and during the sweep from the stop frequency to the start frequency. Z-BLANK
OUT is high when the HP 3326A is not sweeping.
Discrete Frequency Sweep
Z-BLANK OUT drops low at the start of a sweep sequence and remains low until the
end of a sweep sequence. At the end of a sweep, Z-BLANK OUT goes to a high level
and remains high until another sweep is initiated.