F700 Thermometry Bridge Standard.
The Model F700 Thermometry Bridge Standard is a high accuracy resistance bridge designed specifically
for resistance thermometry.
Its unique AC bridge circuitry eliminates thermal EMF effects to provide you with
fast, reliable measurements under a wide range of real operating conditions.
F700 Thermometry Bridge a special input guard circuit maintains accuracy by minimizing the effect of probe
or cable leakage to ground.
Thermometry Bridge Standard
| Model | Description |
|---|---|
| F700 | Model F700 Thermometry Bridge Standard |
The effect of cable and probe reactance is eliminated by an on-board quadrature servo allowing you typically
to make measurements up to 100 meters from the PRT.
The differential capability allows the resistance of one PRT to be measured against another
directly and
provides the most accurate comparison calibration technique.
The F700 can be used with one or more switchboxes for multi channel calibration.
| Accuracy | F700A: | <±1ppm
of reading or 1 digit, whichever is the greater. Equivalent to 0.25mK @ unity ratio (0.01°C) or 1mK over the full range |
| F700B: | <±0.5ppm
of reading or 1 digit, whichever is the greater. Equivalent to 0.25mK @ unity ratio (0.01°C) or 0.5mK over the full range |
|
|
Temperature equivalents for 25.5ohm SPRT against a 25ohm standard @ 1mA |
||
| F700A: | <±5ppm @
unity ratio, equivalent to 6mK up to 1064°C |
|
| F700B: | <±2.5ppm
@ unity ratio, equivalent to 3mK up to 1064°C |
|
| Temperature equivalents for 0.25ohm HTSPRT against a 1ohm standard @ 10mA | ||
| Resolution | 1 least significant digit | |
| Linearity | <±1 least significant digit | |
| Measurement time | 10 second for full balance | |
| Warm up time |
<30 seconds with external standard,
<5 minutes with internal standard |
|
| Thermometers |
R0.01 of 1000ohm, 100ohm,25ohm,
10ohm, 1ohm, 0.25ohm and any intermediate value |
|
| External standard resistor range | 1ohm to 1000ohm AC/DC resistance | |
| Internal Standard Resistor |
100 ohm ±50ppm, with t/c of
<0.3ppm/°C, in a temperature controlled oven at 36°C. A trim control allows calibration against an external standard. |
|
| Measurement Range | 0-3.999999 ratio of two resistors; 0-3.999999 ohms where Rs = 1 ohm | |
|
0-399.9999 ohms where Rs = 100 ohms;
0-1500.000 ohms where Rs = 1000 ohms. |
||
| Sensor current |
0.1, 0.2, 0.5, 1 ,2, 5, or 10mA plus
root2 multiplier. Constant current, stabilized to ±1% of nominal value. |
|
| Communications | RS232 | 300 baud, 8 bits, no parity and 2 stop bits |
| IEEE-488 | Address selectable from 0 to 15 | |
| Analogue outputs | ±10V null balance signal, unfiltered P.S.D output | |
| ±10V null balance signal, filtered output (1 Hz bandwidth) | ||
| Operating conditions | 0°C to 30°C (32°F to 86°F), 10 to 90%RH | |
| Power requirements |
240,220,120,100 VAC (±10%)
selectable on rear panel, 50 or 60 Hz, 70VA max. |
|
| Dimensions / weight | 520mm (W) x 155mm (H) x 466mm (D). 3U x 19" front panel. 15Kg | |