Service manual

Model 5304A
Circuit Diagrams
Table 9D-8-1. Instrument Interconnection List
PIN NO.
SIGNAL NAME
DESCRIPTION
1
+5 V
2 -5 V Input DC from 5300A
3 -1 7 V
4
GROUND
5 * Fl This is the signal to be accumulated in the counter after gating
by the control circuit.
6 *
"9" Goes low when the counter reaches 9% full scale.
7 *
F2 The input signal to the time base gated by the control circuit.
8
INHIBIT High during the measurement cycle, low during the display cycle.
9 *
OPEN Low signal forces the main gate flip-flop to the open position.
10 *
CLOSE Ix)w signal forces the main gate flip-flop to the close position
11
LOG logarithmic output pulse train from time base triggers main gate
flip-flop on rising edge.
12
MGFF Main gate flip-flop signal is low when gate is open.
13 EXPONENT
Inverted log pulses while main gate is open indicates number
of auto ranging steps.
14
NO CONNECTION
15
RESET
High signal resets all registers.
16
CLOCK
10 MHz reference signal from crystal oscillator.
17 *
MAX TIME
Low signal enables closing of the gate on next log pulse.
Rising edge initiates display cycle.
18
TIME BASE OUTPUT
Output from the time base decade position selected by the time
base select code on pins 22, 23, and 24.
r
19
PRINT
Ix)W signal provides print command to rear panel connector.
^20
TRANSFER
I>ow signal transfers data to display. High signal stores data.
21 * 1 MHz TIME BASE INPUT
Input direct from plug-on bypasses control circuit.
22 *
23 *
24 *
TIME BASE SELECT A
TIME BASE SELECT B
TIME BASE SELECT C
Time base select code A. B, and C selects the time base
division factor of the signal at the time base output
at pin 18.
r
*\50
+22 V
Full wave rectified voltage from the power transformer secondary.
Provides power to charge the battery pack. If no battery pack is
used, pin 2ft is connected via the plug-on to pin 50.
26 + 17 V
27 *
H7
28 *
"M
Pins 27 through 31 provide the drive to the annunciator lights.
29 *
s
on the front panel. A low signal lights the corresponding indicator.
30 *
K
31 *
71
32
MANUAL RESET
Ixjw signal from front panel pushbutton switch on rear panel
input clears the system to zero.
33 * DPT
lx)w signal activates decimal point 1.
34 *
DP2
Ix)w signal activates decimal point 2.
* - Source
9D-8-2