HP 8340A Operating Manual page 188

xv
Recorder Function
70108
Option 002
7015 8
70358
70048
7034A
7040A
7041A Option 040
70448
70458
70468
7047A
Recorder (Servo) Mute:
swept over multiple bands, the RF is momentarily
turned off at the band switchpoints. To prevent
this from causing negative spikes on the X-Y recor­
der trace, the recorder's servo motor can be
muted during the band crossing. The MUTE OUT­
PUT 8NC connector on the rear panel of the
8340A performs this function, and must be con­
nected to both the recorder's X and Y MUTE
inputs, the locations of which are shown in Table 1.
As Table 1 also shows, some HP X-Y recorders do
not have a MUTE function. When using one of
these recorders, the negative spikes at band
switchpoints can still be prevented by pressing
on the
activates a function which generates a pen lift
signal at each band crossing, thus avoiding the
spikes. This function is operable only . i f the 8340A
sweep time has been set to a value greater than 5
sec. Once activated, the function is turned off by
pressing again. No change in the pen
Table 1.
Mute Mute Function
Pin Number
A2J2 pin 4
Std. A3J2 pin 4
A4J5 pin L
A4J5 pin R
A4J5 pin L
Std.
A4J5 pin R
N/A N/A
N/A N/A
N/A N/A
Refer to Section 111 of the Recorder's Operating
Std.
and Service Manual.
X=pin 5
Y=pin 6
Std. 4
4
Std.
Std. 4
Std. 4
When the 8340A
8340A front panel. This
Scans by HB9HCA and HB9FSX
HP X-Y Recorders
PEN LIFT
Pin Number
3
3
18
18
18
1
1
1
34
1
is lift connections is required to implement this
function.
programmed via H P-18. The programming codes
are as follows:
SHT21 Enable PEN LIFT during band crossing
SHT20 Disable PEN LIFT during band crossing
As Figure 1 shows, the
be used as a substitute for the MUTE function
even on those X-Y recorders that do have MUTE
capability.
Figure 2 shows a plot of internally leveled output
power'from the 8340A vs. frequency. The plot was
generated on an HP 7045 8 X-Y recorder. The out­
put power from the 8340A was monitored with an
HP 8485A Power Sensor and HP 436A Power
Meter, whose RECORDER OUTPUT provided the
Y-axis input to the 70458.
2
Ground Recommended
Pin Number Sweep Times
A2J2 pin 6
A3J2 pin 6
;::: : 2 0 sec.
A4J5 pin
K
A4J5 pin P
A4J5 pin
K
;::: : 2 0 sec.
A4J5 pin P
6 ;::: : 2 0 sec.
;::: : 1 0 sec.
6
;::: : 1 0 sec.
6
;::: : 1 0 sec.
3
>10 sec.
20
20 >10 sec.
19 >1
O
>10 sec.
20
function may also be remotely
function may
sec.