SURFACE CURRENT DENSITY (q.s)
MODELS SD-S10, SD-S30
DESCRIPTION
The PRODYN Models SD-S10 and SD-S30 sensors are qs or D. sensors that are equivalent to the AFWL
Models HSD-SI and HSD-S3 respectively. These sensors can be used as D-dot sensors or they can be
used to measure the time rate-of-change of surface current density. The sensor consists of a hemis-
pherical dome supported above a metal mounting surface by a dielectric ring.
The equation pertinent to this device is:
Vo = R Aeq dqs = sensor output (in volts)
dt
where
R = load resistance (50W )
Aeq = sensor equivalent area
qs = surface current density (coul/m2 )
The sensors are passive devices, therefore, an external power source is not required. The sensors
are equipped for purging with a gas such as dry air, nitrogen or SF6.
SPECIFICATIONS
| Electrical | SD-S10 |
SD-S30 |
| Equivalent Area (Aeq) | 1 x 10-1m2 |
1 x10-2m2 |
| Frequency Response (3 db point) | >130MHz |
>350MHz |
| Risetime (tr 10 - 90) | > 2.7 ns |
< l.0 ns |
| Maximum output (peak) | + 4kv |
+ 4kv |
| Output Connector (s) | GR 874-L-50 |
GR 874-L-50 |
| Physical | ||
| Mass | l.6 kg |
1.4 kg |
| Dimensions L (cm) | 36.8 |
22.1 |
| H | 10.9 |
3.8 |
| W | 28.2 |
13.7 |
| t | 0.3 |
0.2 |