HP 61010A Owner's Manual page 46

Single Stage
input Schematics
CAUTION
Excessive input voltages will damage this instrument. Do not
exceed +10 V max. per input bit.
Figure 4-6 shows the input stage for one of the 16 input
bits and the input stage for the IDAV .and ODAC control
signals. The 16 input bits have a programmable threshold
level. Chapter 3 describes how to set the threshold level.
The control signals are compatible with TTL or CMOS
logic levels. (Refer to the specifications in Table 1-1.) For
best results when using your Digital Input, use pin 9 or 22
to make your data common connection. Control signal
common connections can be made on pins 12 and 25.
. ... INPUT DATA BITS
n
INPUT CONTROL SIGNALS
Figure 4-6. Input Data Bits and Input Control Signals
4*6
Front Panel Connections