190
Chapter 29
Technical Specifications
Signal output
An analogue output from the internal signal (noise)
generator.
Max output voltage:
±10 volt.
Output impedance:
< 100 ohm. The output is short-
circuit proof to GND and output current is in excess
of 3 mA
Gain accuracy at 1 kHz:
±0.2 dB.
Frequency response re. 1 kHz:
±0,5dB for 20 Hz < f < 16 kHz.
Serial I/O port
RS232 port, 9600 – 115200 baud. The port may be
switched off to reduce power consumption, which
should be considered if a cable is attached to the
socket.
Digital inputs
The digital input signals are 3.3 V CMOS signals. The
voltage levels must be within –0.25 V to +5.25 V to
avoid harming the instrument.
Input impedance:
10 kohm connected to the positive
supply 3.3 volt. Any open input will therefore be in the
high state.
Digital outputs
The digital output signals are 3.3 V CMOS signals.
Maximum output impedance:
100 ohm. During
power-up the output lines will be low or in a high-
impedance state (100 kohm to ground).
Pin Signal Dir. Remarks
1
DO-1
Out
Digital output
2
DO-2
Out
Digital output
3
DO-3
Out
Digital output
Reserved for calibration.
(high = calibration ON)
4 RTS
Out RS232
5
TXD
Out
RS232
6
PWR
Out
3.3 V, max 10 mA
7 RES
In Reset
8
DI-1
In
Digital input -
Reserved for ext.trig.
9
DI-2
In
Digital input
10
DI-3
In
Digital input
11
DO-4
Out
Digital output
12 CTS
In RS232
13 RXD
In RS232
14
GND
ref. analogue signal
15
AC-out
Out
Noise output
Housing GND
Instrument casing
The general
i
/
o
socket
15
8
1
9
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