Guarded High Resistance Standards
- LEADING MANUFACTURER - OVER 300 STANDARDS BUILT & DELIVERED
- RESISTANCE FROM 1 MΩ TO 10 TΩ
- NEW: IMPROVED TCR & VCR
- TYPE N, TRIAX or BNC CONNECTORS
- HIGH IMMUNITY FROM ENVIRONMENTAL EFFECTS
- FULLY GUARDED – FOR ANY RATIO ON ANY MEASUREMENT SYSTEM
Ohm-Labs is the leader in guarded high resistance standards, the first to manufacture this design commercially, and the most experienced, wtih hundreds of guarded high resistance standards delivered to labs around the world.
The 100-series guarded high resistance standards are designed for laboratory or on-site calibration use. Their low coefficients of temperature allow them to be used in a variety of environments without loss of accuracy. Hermetically sealed construction provides immunity from changes in barometric pressure and relative humidity. They are not affected by moderate vibration or shock. Low reactance allows their use as DC or AC standards. All models are housed in a rugged, die-cast aluminum case.
Connection is via type N sockets. The shields are for a guard circuit driven at measurement potential. Either terminal may be high. Triax, BNC or BPO connectors are available as options.
The guards are internally connected by a high value resistor nominally equal to the standard. This provides balanced guard voltages for any type of measurement system at any ratio.
A 5-way insulated binding post for banana plugs or spade lugs is provided for grounding the case.
A 10 K (nominal, at 25 °C) thermistor is included to monitor the internal temperature of the standard. Connection is via standard 2 mm mini banana plugs.
Decade resistance values are standard; other values are available on request.
All models include ISO 17025 accredited calibration at two voltages and temperature coefficient determination.
A lower accuracy -AF type is available in compliance with Air Force specifications.
| Model Number |
Nominal Resistance |
Initial Tolerance in ppm |
Temperature Coefficient (less than) |
Voltage Coefficient (less than} |
6 month Stability |
12 month Stability |
Recom. Voltage |
| 106-H | 1 Meg | 5 | 1 ppm / °C | 0.1 ppm / V | <3 ppm | <5 ppm | 10 |
| 107-H | 10 Meg | 10 | 10 | 0.1 | 5 | 10 | 20 |
| 108 | 100 Meg | 20 | 20 | 0.1 | 10 | 20 | 50 |
| 109 | 1 Gig | 35 | 30 | 0.1 | 15 | 25 | 100 |
| 110 | 10 Gig | 50 | 35 | 0.1 | 25 | 50 | 100 |
| 111 | 100 Gig | 200 | 50 | 0.2 | 50 | 100 | 200 |
| 112 | 1 Tera | 500 | 50 | 1 | 100 | 200 | 500 |
| 113 | 10 Tera | 1000 | 500 | 2 | 150 | 300 | 500 |
Notes
- Tolerance is at time of manufacture.
- Temperature coefficient is at nominal 23 °C +/-5°C.
- Voltage coefficient is at recommended –50 % / +100 %
- Max V: 106 1 kV, 107 3 kV, 108-110 10 kV, 111-113: 15 kV
- 10 teraohm and above models are pending product redesign
Physical
- 22 x 13 x 13 cm / 8.5 x 5 x 5 in; 2.5 kg / 5 lbs
Accessories
- Thermistor cable: 2 meters, standard to mini dual banana
- Transit Cases for 1, 2 or 4 standards
