IET LABS SRC-100T-TN Resistance Standard

IET LABS SRC-100T-TN Resistance Standard

• Wide range of values - 10 TΩ to 1 PΩ
• Very stable - 500 ppm/yr
• ISO-17025 accredited calibration included
• Excellent TC - 25 ppm/°C

The SRC-Tnetwork is a standard resistor designed for calibration of various electrometers and megohmmeters.

The SRC-Tnetwork is a high resistance standard that uses 3 lower value resistors configured in a T network to create a higher resistance.

T-Networks

For high resistance measurements a T-network is often used with instruments such as electrometers and megohmmeters equipped with a guard terminal.

A T-network uses low value resistors to achieve what electronically looks like a high value resistor.

The basic operation of a T-network is three resistors are place in a T configuration and connected to the positive, negative and guard terminals of the megohmmeter.

The ratio of the resistors then determines the effective resistance value that will actually be displayed by the megohmmeter.

The advantages of the T network is that low value resistors are used that can be easily and accurately measured as compared with trying to calibrate a single high value resistor.

The use of binding posts makes it easy to connect to a wide variety of megohmmeters. The use of Kel-F washers under the binding posts minimizes leakage.

The bnc connector provides easy access to the center tap of the T network for calibration, without having to open the housing.

A shorting link allows for guard to be connected to chassis or be used separately depending upon the megohmmeter being calibrated.

Specificatiion

SRC-TN T-Network High Resistance Standard Basic Specifications

Resistance Test