HP 5326A - Page 11

Model 5326/27A
Installation
2-24. Function Selection Programming
2-25. To program the desired function, ground (<.7 V)
the proper line at J10 as follows:
STOP
Pin 32
START
Pins 1 and 32
PERIOD AVERAGE Pin 2
T.I. AVG.
Pin 3
T.I. A to B Pin 4
PERIOD
Pin 5
FREQ. A Pin 6
FREQ. C DIRECT Pin 7
FREQ. C + 10
Pins 7 and 18
2-26. Time Base Selection Programming
2-27. To program the Time Base, ground (<.7 V) the
proper line at J10 as follows:
.1 p s/1
Pin 19
1 ps/10
Pin 20
10 ps/10 2
Pin 21
.1 ms/l0 :J
Pin 22
1 ms/'10 4
Pin 23
10 ms/10 5
Pin 24
.1 s/10 6
Pin 25
1 s/10 7
Pin 26
10 s/10 8
Pin 27
2-28. Trigger Level Programming
2-29. To program the trigger level, the LEVEL con¬
trols must be set to PRESET. Select the trigger level
by placing a dc voltage between -3.0 and +3.0 volts on
the level input line (Level A = JIO pin 30, Level B = JiO
pin 31). This voltage, times the attenuator setting, is
the trigger level. Preset is programmed by leaving the
pin open on contact closure to ground. Grounding
is preferable if noise exists on the remote program¬
ming line.
2-30. The front-panel LEVEL controls may be used
manually if programming of the trigger levels is un¬
desirable. Also, note the AC/DC and ATTEN switches
on the front-panel must be set manually, as they are
NOT programmable.
2-31. Sample Rate Adjustment
2-32. Adjusting the display time can be accomplished
in several ways:
a. Manually adjust the display time by using the
front-panel SAMPLE RATE controls.
b. Set the SAMPLE RATE control cw and the
FAST/NORM/HOLD switch to NORM and connect a
1 megohm pot in series with a 1.5k ohm resistor from
+5 V to pin 35. This will give a display time range of
about 10 ms to 5 sec. If a shorter time is desired, set the
FAST/NORM/HOLI) switch to FAST, which gives a
range of about 50 ps to 10 ms.
c. Set the SAMPLE RATE control cw in FAST
and hold the Hold line (pin 35) to ground for the desired
display time. The display will continue for about 100
ps after the ground is released.
2-33. REMOTE PROGRAMMING, OPTION 004
2-34. The following paragraphs describe remote pro¬
gramming requirements for the counter with Option
004.
2-35. Front Panel Controls
2-36. All front-panel controls are programmable, ex¬
cept the FAST/NORM/HOLD switch. The trigger
level controls may be remotely programmed, or the
front-panel LEVEL controls may be used. It is pos¬
sible to program the front-panel LEVEL controls with¬
out programming the remainder of the front-panel
controls. When remote programming the trigger
levels, the LEVEL controls must be set to PRESET.
The display time may be remotely programmed and/
or the front-panel controls may be used.
2-37. Remote Programming Requirements
2-38. All lines may be controlled by TTL or DTL
signals or contact closure to ground when the unit is
being remotely programmed: except the trigger levels
which are programmed by an analog level (if pro¬
grammed) and the display time line (Hold), J10 pin 16,
which should NOT be pulled up to +5 V by less than
200H while programming.
2-39. When the unit is NOT being programmed (EXT
line high), all the lines should be left open or pulled
up to +5 V by not less than 5kQ, except the trigger
levels, which should be open circuited.
2-3