The GRAS 1/2" Preamplifier GRAS 26CI is a preamplifier optimized for low frequency use together with prepolarized condenser microphones. It is a small, robust unit and uses a GRAS CCP power supply (ICP ®), e.g. GRAS 12AL. It has a very low inherent noise level, and a large dynamic range and a frequency response from below 1 Hz to above 200 kHz.
Technology
Typical applications and use
CCP inputs
Prepolarized microphones
1/2" precision microphones
High levels and high frequencies
Design
The GRAS 1/2" Preamplifier GRAS 26CI is a small, robust unit and uses a GRAS CCP power supply, e.g. GRAS 12AL. It has a very low inherent noise level, a large dynamic range and a frequency response from 1 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.
The GRAS 26CI is provided with a built-in TEDS* chip, and can be programmed as a single unit with a microphone fitted. It is primarily intended for the low frequency microphone 46AZ but can be used with all GRAS 1/2" prepolarized microphones and with adapters with other microphone sizes.
It has an integrated BNC output connector. The casing is made of stainless steel for maximum strength and durability.
* Transducer Electronic Data Sheet - as proposed by IEEE-P1451.4
Specifications
| Parameter |
Unit |
Value |
| Frequency range (±0.2 dB) with 18 pF microphone dummy |
Hz |
1 to 200 k |
| Slew rate |
V/µs |
20 |
| Input impedance |
GΩ // pF |
40 // 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 |
-0.35 |
| Power supply (Constant Current Power) |
mA |
2 to 20 (typical 4) |
| DC bias voltage, typ. |
V |
12 |
| Temperature range, operation |
°C / °F |
-30 to 70 / -22 to 158 |
| 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.
GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.
Dimensions
(1).jpg)
