TC of ±25 ppm/°C from -55°C to +125°C, Resistance Range from 25 Kohm to 1,000 Megohm
To meet the precision temperature stability requirements of high accuracy, high voltage systems, Caddock offers the Type TG Low TC Precision High Voltage Resistors. These resistors utilize our proven Tetrinox® resistance film system to achieve the unique combination of low temperature coefficient with high stability performance at high operating voltages.
The Type TG Low TC Precision High Voltage Resistors are designed to meet the demanding stability requirements of TWT power supplies, electron microscopes, semiconductor process equipment, spectrographic equipment, X-ray systems, high stability electron beam equipment, geophysical instruments, HV precision dividers, and HV precision probes.
The performance features of the Type TG Low TC Precision High Voltage Resistors are:
- Temperature Coefficient: ±25 ppm/°C from -55°C to +125°C, referenced to +25°C.
- Load Life Stability of 25% per 1,000 hours at +125°C.
- Resistance Tolerance from ±1% to ±0.1%.
- Resistance Range from 25 Kohm to 1,000
- The low temperature coefficient minimizes the self-drift due to power dissipation warm-up.
Tetrinox® Resistance Films
Type TG Low Temperature Coefficient and High Stability Performance is based upon Caddock’s unique Tetrinox® resistance film system, produced exclusively by Caddock Electronics. These proven complex metal oxide films have been used reliably for over 40 years in Caddock’s Low TC Precision High Voltage Resistor products, as well as in Resistor Networks with Low Ratio TC and in Low Absolute TC discrete Resistors.
Tetrinox® Low TC Resistance Films are deposited directly onto the solid ceramic core of the Type TG Resistor and fired at temperatures above 1400°F (760°C) to achieve the excellent Low TC performance.
“-15” Extended Max. Continuous Operating Voltage
Extended maximum continuous operating voltages, at +85°C, of up to 60% higher than the standard maximum voltage ratings listed in the table, can be achieved through special factory conditioning. To specify the extended maximum continuous operating voltage add a “-15” to the model number (Example: TG950-15-200M-1%). The Resistance range for the “-15%” voltage rating is listed in the table from “-15 Min.” to “Std. Max.” Note that the standard overload and overvoltage ratings do not apply to the “-15” resistors.
Discrete Type TG and Type USG High Voltage Resistors with Very Low Absolute TC
Type TG Low TC Precision High Voltage Resistors can be manufactured with a very low absolute temperature coeffient of ±15 ppm/°C, -40°C to +85°C, referenced to +25°C. Contact Applications Engineering.
Type USG Ultra-Stable High Voltage Resistors are available with an absolute temperature coefficient of ±10 ppm/°C, -40°C to +85°C, referenced to +25°C, in standard resistance values of 50 Meg, 75 Meg, 100 Meg, 150 Meg, or 200 Meg. See the Type USG datasheet.
Selected Resistor Sets with Ultra Low Absolute TC
Type USGS Selected Resistor Sets are available with Absolute Temperature Coefficient of ±5 ppm/°C, +10°C to +50°C, ref. to +25°C.
Type USFS Selected Resistor Sets are available with Absolute Temperature Coefficient of ±2 ppm/°C, +10°C to +50°C, ref. to +25°C.
Type TG Resistors can be matched to achieve Low Ratio Temperature Coefficient Tracking
Ratio Temperature Coefficient of 10 ppm/°C, -40°C to +85°C, referenced to +25°C can be achieved by TC matching one larger Type TG Low TC Precision High Voltage Resistor (up to Model TG980, 15kV) with one small body Type TG resistor (Example: TG913). The low, essentially linear, absolute temperature coefficient of the Type TG resistors will minimize ratio drift during warm up, while maintaining the tight Ratio TC Tracking after warm-up.
|Standard||±1%; also ±0.1%, ±0.25%, ±0.5%|
|With “-15” rating||±1%|
Temperature Coefficient: ±25 ppm/°C refer- enced to +25°C, DR at -55°C and +125°C
Voltage Coefficient: Low Voltage Coefficient,
Contact Caddock Applications Engineering
Overload/Overvoltage: 5 times rated power with applied voltage not to exceed 1.5 times max- imum continuous operating voltage for 5 seconds, DC Voltage or VACrms
|Resistance Range||Overload/Overvoltage, DR|
|With standard ratings||0.5% max.|
|With “-15” rating||N/A|
Load Life: 1,000 hours at rated voltage, not to exceed rated power.
|Resistance Range||Load Life, DR|
|With standard ratings||0.25% max. at +125°C|
|With “-15” rating||0.40% max. at +85°C|
Extended Life Stability: 0.03% maximum per
1,000 hours at +125°C (standard ratings).
Thermal Shock: Mil-Std-202, Method 107, Cond. C, DR 0.25% max.
Moisture Resistance: Mil-Std-202, Method 106,
DR 0.4% max.
Insulation Resistance: 10,000 Megohms, min.
Derating Curve (applies to the ratings listed in the table):