PERFORMANCE

Measurement Range
0 to ±20 kV DC or peak AC.

Accuracy
Better than ±0.1% of full scale
as referred to the voltage monitor).

Speed of Response 
(10% to 90%) 
Less than 200 µs for a 1 kV step change.
Less than 5 ms for a 20 kV step change. 

Full Signal Bandwidth 
DC to better than 25 Hz.

Stability
Drift with Time
Less than 100 ppm/hour, noncumulative.
Drift with Temperature
Less than 200 ppm/°C.

PRODUCT FEATURES

High-Voltage Ready LED
A LED indicator illuminates when the Model 341B electrostatic voltmeter is ready to make high-voltage measurements.

High-Voltage ON/OFF
A two-position toggle switch that turns on and off the high voltage supply inside the instrument.  This switch will only function when the High-Voltage Ready LED is illuminated.

Zero Adjust
A ten-turn control to null offsets or other zero errors which occur within the system.

Voltage Monitor Output

A buffered output providing a replica of the measured voltage.
Scale 
1/1000th of the measured voltage.
Output Noise
Less than 20 mV rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).
Output Impedance
Less than 0.1 Ω

Voltage Display
4 1/2 digit LED display.
Range
0 to ±19999 V.
Resolution
1 V.
Zero Offset
Less than ±2 counts, referred to the voltage monitor.
Sampling Rate
Three (3) readings per second.

GENERAL

Power Requirements
Line Supply 
Factory set for one of two ranges:
90 to 127 V AC or 180 to 250 V AC, at 48 to 63 Hz
(specify when ordering). 

Operating Conditions
Temperature
0°C to 40°C.
Relative Humidity
To 90%, noncondensing.

Dimensions
230 mm H x 441 mm W x 432 mm L
(9.06" H x 17.36"  W x 17" L).

Weight
17 kg (37 lb).

Voltage Monitor Connector
BNC coaxial connector.

Ground Receptacle
Binding post.

Power On/Off 
A two-position rocker switch that turns on and off the main power.

AC Line Cord Receptacle
Standard three-prong line cord receptacle with an integral fuse holder.

ACCESSORIES

Accessories Supplied

• Operator’s manual and line cord.

Optional

• Model 3450EC Probe Extension Cable 
  (from Model 341B to Probe) (p/n17218) 
  
  Full-Rack Mounting Kit 612RA Rack Mount Kit (19-inch) (p/n C4085)

Product Option: Model 341B-1
Utilizes separate Line Driver for probe cable lengths up to 7 meters.
Model 3460-1 Line Driver (p/n 17181) is included with the Model 341B-1.

PROBE

Probe holder assembly (not supplied) should be of a non-dissipative material with insulating properties of more than 
10¹⁰ Ω and be able to withstand voltages of more 
than ±25 kV. 

Recommended Probe-to-Surface Separation
3 mm ±1 mm.

Standard Resolution Probe
Model 3450 (side viewing).
Aperture Size 
3.05 mm x 1.52 mm.

High Temperature Probes 
(up to 100 °C)
Model 3455ET (end-viewing).
Aperture Size 
1.52 mm diameter.
Model 3453ST (side-viewing).
Aperture Size 
3.05 mm x 1.52 mm.

Probe Body Type
Square. 

Dimensions 
11.8 mm H x 11.1 mm W x 76 mm L
(0.5" H x 0.4" W x 3" L).

Probe Cable Length
3048 mm ±76 mm (10 ft. ±3 in.).
[Model 341B-1 utilizes separate Line Driver for probe cable lengths up to 7 meters].

CERTIFICATION

TREK, INC. certifies that each Model 341B is tested and calibrated to specifications using measurement equipment traceable to the National Institute of Standards and Technology or traceable to consensus standards. A Certificate of Calibration accompanies each instrument when it is shipped from the factory.

Low-Voltage Safety Compliance 
(EN 61010-1)
Overvoltage Category
CAT II: Local-level mains, appliances, portable equipment.
Pollution Category
Degree 1: Operate in environments where no pollution or only dry, nonconductive pollution occurs.

All specifications are subject to change.