Minebea DSA-631, Instruction Manual

Page: 41 / 64

31
4-3. Connection of Output to Load
Two types of outputs are available. OUTPUT1 and OUTPUT2
(1)
OUTPUT1 4
Delivers a voltage of
±
10 V and a current of
±
5 mA (into a load of 2 k
Ω
), allowing voltage input type
instruments such as thermal dot recorders and data acquisition devices to be connected to
OUTPUT1.
Thus output is displayed on the monitoring meter (2).
(2) OUTPUT2 5
Delivers a voltage of
±
10 V and a current of
±
10 mA (into a load of 332
Ω
).
the output voltage of OUTPUT2 can be varied from
±
10 V to approximately
±
1 V with the level
adjustment control (18). Because this output can be displayed digitally on the digital monitor (3), it
can also be displayed as a physical amount by adjusting the output voltage (scaling).
4-3-1. Connection of Output to Data Recorder
Special care must be taken with the input level of data recorders. Especially with frequency
modulated data recorders, if an input signal greater than the allowable input level of the data
recorder is applied, it may be overmodulated, causing failure in recording. To avoid this, the
amplifier unit is capable of displaying excessive output voltage.
As shown in Fig. 4-5, if the input signal exceeds the threshold level (approximately
±
10.5 V), an
LED located on the right or left side of the reading blinks for a certain period of time. An excessive
level up to a frequency of approximately 1 kHz can be checked on the monitoring meter.
Approx. 10.5 V
10 V
0 V
ー
10 V
Approx.
ー
10 V
Ｌ
0
Ｒ
0
Ｒ
1
Ｒ
2
Ｒ
i
Ｃ
i
DSA-631
Voltage
dividing circuit
Data recorder
Fig. 4-5 Fig. 4-6
Care must be taken concerning the following points for connection to a data recorder.
(1) Where direct connections can be made
If a data recorder is capable of accepting a signal of more than 20 Vp-p (
±
10 V), it can be directly
connected to the amplifier unit.