Trek 347 DC Stable Electrostatic Voltmeter - Manual (Page 2)

Model 347 Specifications
Performance
Measurement Range 0 to ±3 kV DC or peak AC
Measurement Accuracy
Voltage Monitor Output Better than ±0.05%
Voltage Display Better than ±0.1% of full scale, referred to
the voltage monitor
Speed of Response
(10% to 90%) Less than 3 ms for 1 kV step
Stability
Drift with Time Less than 100 ppm/hour, noncumulative
Drift with Temperature Less than 100 ppm/˚C
Voltage Monitor
Output A buffered output provides a low-voltage
replica of the measured voltage
Ratio 1/100th of the measured voltage
(Other scale factors available)
Output Noise Less than 2 mV rms*
Output Impedance Less than 0.1 W
Front Panel Meter
Voltage Display 3 ¾ digit LED display
Range 0 to V ±3 k
Resolution 1 V
Zero Offset ±1 count
Sampling Rate 2.5 readings per second
Features
Zero Control A multi-turn control to produce zero volts
output when the probe is coupled to a
known zero volt surface
Automatic Gain Control A ten-position, push-button switch that
adjusts the gain of the 347 to optimize the
AC response. The response control is
normally adjusted when changing the
type of probe being used or when
changing the probe-to-surface
separation.
Digital Enable An open collector, TTL compatible input
to turn on and off the internal high-voltage
power supply. A TTL high will turn off the
high voltage. A TTL low will turn on the
high voltage.
Mechanical
Dimensions 108 mm H x 233 mm W x 357 mm D
(4.25” H x 8.75” W x 14” D)
Weight 3 kg (6.6 lb)
Voltage Monitor
Output Connector BNC connector
Digital Enable
Connector BNC connector
Probe to Surface
Separation 2 mm, ±1 mm (recommended)
Operating Conditions
Temperature 0°C to 40°C (32°F to 104°F)
Relative Humidity To 90%, noncondensing
Altitude To 2000 m (6561.68 ft.)
Electrical
AC Line Cord
Receptacle Standard 3-prong with integral power switch
and fuse holder
Line Voltage Factory set for one of two ranges: 90 to 127
V AC or 180 to 250 V AC, at 48 to 63 Hz
Power Consumption 50 VA, maximum
Supplied Accessories
Operator’s Manual PN: 23106
Line Cord PN: N5002 (for 90 to 127 V AC)
PN: Determined by the geographical
destination (for 180 to 250 V AC)
Optional Accessories
Probes Please refer to Page 1
Probe Line Driver
(required when the
probe cable length
exceeds 6 meters Model: 6003B
Probe Extension
Cable (from the 347
to the driver) Model: 6004B-EC
Probe Extension
Cable (from the 347
to the probe) Model: 6005B-EC
Full-Rack Mount Kit
Half-Rack Mount Kit Model: 603RA
Model: 604RA
Copyright ã 2012 TREK, INC. All specifications are subject to change. 1230/DEC
Measurement and Power Solutions TM
*Measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter