PERFORMANCE

All specifications are with a 3627 probe (standard) or 3629A probe (transparent ) with a probe-to-surface separation of 2 mm unless otherwise noted.

Measurement Range
0 to ±3 kV DC or peak AC

Measurement Accuracy
At the Voltage Monitor
Better than ±0.05% of full scale.

Measurement Accuracy
At the Voltage Display
Better than ±0.1% of full scale
±1 count, referred to the voltage
monitor. Note: The measurement
accuracy degrades to the larger of
±1.2% or 36 V in the presence of
line transients or RF fields up to
3 V/m.

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

Stability
Drift with Time
Less than 150 ppm/hour, noncumulative.
Drift with Temperature
Less than 100 ppm/°C.

Data Acquisition Module (Optional)

Provides data output using an IEEE-488 compatible interface.
Resolution
14 bit.
Accuracy
12 bit.
Sampling Period
Programmable from 10 µs to 30 minutes.
Storage
32 Kbytes (16 Kbytes of data words).
Acquisition Start Signal
External trigger or IEEE-488 Talk Enable or Group Trigger command.
Successive Data Acquisition
Internal timer or external trigger.
Interface Functions
SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT0, C0, E2.
Address
Switch selectable between 0 and 30.

ACCESSORIES

Accessories Supplied

• Operator’s manual, an IEC line cord for 90 to 127 V AC voltage source, or an unterminated power cord for a 180 to 250 AC line with the international color code as follows: brown-line, blue-neutral, and green/yellow-ground.

PRODUCT FEATURES

Zero Control
A momentary push-button switch to produce zero volts output when the probe is coupled to a known zero volt surface.

Automatic Gain
The Model 370TR automatically optimizes the AC response when changing the type of probe being used or when changing the probe-to-surface separation.

Voltage Monitor Output
A buffered output providing a low-voltage replica of the measured voltage.
Scale 
1/100th of the measured voltage.
(1/200, 1/300, 1/600, 1/1000 options available.)
Offset Voltage
Less than 10 mV.
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.
Output Current Limit
±10 mA.

Voltage Display
4-character, 7-segment LED display.
Range
0 to ±3000 V.
Resolution
1 V.
Zero Offset
±1 count, referred to the voltage monitor.
Sampling Rate
2.5 readings per second.

Digital Enable
An open collector, TTL compatible input to enable or disable the measurement. A TTL high (or open) will disable the measurement. A TTL low will enable the measurement

PROBES

Probe-to-Surface Separation
(recommended)
2 mm ± 1 mm.

Model 3629A (Transparent)
Body Shape
Square.
Aperture Size
5.3 mm diameter.
Aperture Location
Side.
Dimensions
14.3 mm h x 21.9 mm w x 87.5 mm L

Model 3627
Body Shape
Square.
Aperture Size
1.5 mm x 3.0 mm.
Aperture Location
Side.
Dimensions
11.8 mm H x 11.1 mm W x 76.0 mm L

GENERAL

Power Requirements
Line Voltage
90 to 127 V AC 50 to 60 Hz.
(180 to 250 V AC, at 50 to 60 Hz optionally available).

Power Consumption
100 VA, maximum.

Operating Conditions
Temperature
0°C to 40°C.
Relative Humidity
To 85%, noncondensing.

Dimensions
108 mm H x 223 mm W x 430 mm D
(4.25" H x 8.75" W x 17" D).

Weight
5 kg (11 lb).

Voltage Monitor Connector
BNC coaxial connector.

Digital Enable
BNC coaxial connector.

Ground Receptacle
Binding post.

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

CERTIFICATION

TREK, INC. certifies that each Model 370TR 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.

All specifications are subject to change.