Appendix 4 If the Model 9784 DC Power Unit is Installed
A13
Appendix
The Model 9784 enables the instrument to be operated from a DC power source such as a battery.
When both AC power and the Model 9784 DC Power Unit are connected to the
instrument, the AC power source has priority. However, when the instrument is
operating from AC power and the power switch of the Model 9784 is on, the
9784 is in standby state, and some power is still consumed from the DC source.
We therefore recommend turning the Model 9784 off when it is not being used.
The input voltage range of Model 9784 is 10 V DC to 28 V DC. (Voltage fluctua-
tions of ±10% from the supply voltage are taken into account.)
9784 DC Power Unit
Specifications
Appendix 4 If the Model 9784 DC Power Unit is
Installed
• Before connecting to a battery, confirm that the power switch on the Power
Unit is turned off. Connecting to a battery while the Power Unit is turned on
may produce sparks and could damage the instrument.
• Make sure that the Power Unit's ventilation holes are not obstructed. Other-
wise, the instrument could be damaged or a fire could result.
Whenever making DC power connections to the Power Unit, observe polarity
carefully, and make connections securely. Reversed-polarity connections may
damage the Power Unit.
Accuracy is specified at 23±5°C and 20 to 80% RH, 30 minutes after power on
Rated input volt-
age
12 VDC
Input voltage
range
10 to 28 VDC
Maximum rated
power
200 VA
Operating temper-
ature and humidity
Same as 8847
Storage tempera-
ture and humidity
Same as 8847
Operating environ-
ment
Same as 8847
Withstand voltage 700 V DC for 1 min. (between input and output, and between
input and instrument chassis)
Isolation voltage 100 MΩ or more @ 500 V DC (between input and output, and
between input and instrument chassis)
Dimensions Adds approx. 29 mm (D) (1.14"D) to dimensions of Models
8847
Mass Adds approx. 1.20 kg (42.3 oz.) to the weight of Models 8847
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