PPM, Inc. R3-1,110M

DESCRIPTION

The PPM Model R3-1,110M decade resistor box is a precision selectable resistance standard suitable for use as a laboratory secondary standard.

The Model R3-1,110M contains three decades of selectable resistance: 1 megohm per step, 10 megohms per step, and 100 megohms per step. The unit is 12 inches long, 3.5 inches high, and 4 inches deep (excluding the dial knobs).

SWITCHES

Switches have solid silver contacts at all positions. Thermal EMF is extremely low because of the silver contacts. All decades have 11 settings, from 0 through 10. Each decade will meet specified accuracy with switch operation life greater than 200,000 complete cycles (0 to 10 to 0 defined as one cycle).

BINDING POSTS

Binding posts are 5-way low-thermal type on standard 0.75 inch on-center spacing. The "Hi" and "Lo" binding posts are isolated from the case by a Teflon insulator to minimize leakage which could affect resistance accuracy at high values. A ground post is provided with a removable shorting bar to enable connection of the "low" terminal to case.

FREQUENCY CHARACTERISTICS

Inductance is less than 0.8 microhenries (all decades set to zero). Capacitance is less than or equal to 15 pF per decade (any decade set to 10).

SPECIFICATIONS

ACCURACY

+/-0.1% of setting at VDC and 23 +/-1oC,

with a temperature coefficient less than or

equal to +/-20 ppm per degree Centigrade.

MAXIMUM VOLTAGE

1 Megohm per step: 715 volts

10 Megohms per step: 1 KV

100 Megohms per step: 1 KV

MAXIMUM VOLTAGE TO CASE

1 KV DC/peak AC, Hi or Lo terminal to case.

CURRENT PER DECADE

1 Megohm per step: 0.715 mA

10 Megohms per step: 0.1 mA

100 Megohms per step: 0.01 mA

ZERO RESISTANCE

Less than or equal to 0.009 ohms.

* Specifications subject to change without notice.