The GRAS 26CA-HT 1/2" CCP High Temperature Preamp (BNC) is a 1/2" CCP preamplifier for use with prepolarized microphones. It is optimized for high-temperature applications up to 120 °C (248 °F). It has a low inherent noise level, a large dynamic range and a frequency response from 2 Hz to 200 kHz.
Technology
Typical applications and use
Prepolarized microphones
Operating temperature up to 120 °C (248 °F)
Low noise floor and wide frequency range
Design
The GRAS 1/2" Preamplifier 26CA-HT is similar to the GRAS 26CA Standard Preamplifier, but optimzed for use in high-temperature applications up to 120 °C (248 °F).
It uses a CCP (Constant Current Power) supply, e.g. GRAS 12AL 1-Channel CCP Power Module with A-weighting filter. It has a very low inherent noise level, a large dynamic range and a frequency response from below 2 Hz to above 200 kHz. Its small ceramic thick-film substrate has a very high input impedance, and is shielded by a guard ring to minimise the influence of stray capacitance and microphonic interference.
It has TEDS* according to IEEE P1451.4 for easy self identification and reading of calibration data.
It has an integrated BNC output connector and can be used with all GRAS prepolarized microphones. The casing is made of stainless steel for maximum strength and durability.
* Transducer Electronic Data Sheet
Specifications
| Parameter |
Unit |
Value |
| Frequency range (±0.2 dB) with 18 pF microphone dummy |
Hz |
2.5 to 200 k |
| Slew rate |
V/µs |
20 |
| Input impedance |
GΩ // pF |
20 // 0.4 |
| Output impedance |
Ω |
< 50 |
| Output Voltage Swing, min. @ 24–28 V CCP voltage supply |
Vp |
8 |
| Noise (A-Weighted) max. |
µV |
2.5 |
| Noise (A-Weighted) typ. |
µV |
1.8 |
| Noise (Linear 20 Hz – 20 kHz) max. |
µV |
6 |
| Noise (Linear 20 Hz – 20 kHz) typ. |
µV |
3.5 |
| Gain |
dB |
-0.30 |
| Power supply (Constant Current Power) |
mA |
2 to 20 (typical 4) |
| DC bias voltage, typ. |
V |
12 |
| Temperature range, operation |
°C / °F |
-30 to 120 / -22 to 248 |
| Temperature range, storage |
°C / °F |
-40 to 85 / -40 to 185 |
| Humidity range non condensing |
% RH |
0 – 95 |
| TEDS (IEEE 1451.4) |
– |
769 v. 0.9 |
| Connector type |
– |
BNC |
| CE / RoHS compliant / WEEE registered |
– |
Yes / Yes / Yes |
| Weight |
g / oz |
26.0 / 0.92 |
Conditions: 23 °C Ambient temperature, 4 mA / 24 V open loop CCP voltage, 18 pF dummy microphone, 3 m output coax-cable.
The TEDS is guaranteed to work properly up to 85 °C. We have no indication that it will not work properly up to 120 °C, however we cannot guarantee that it will remain stable at this level.
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Noise vs. temperature, linear 20 Hz - 20 kHz
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Typical noise level at 25, 50, 75, 100 and 120 °C, 1/3 octave bands.
GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.
