| The
LMS hardware will run on virtually any computer which provides a full
length ISA bus slot. For laptop use, the PAC4 can provide this external
slot capability, and interface to the computer using a serial COM port
for communication.
The
LMS PC card contains a low distortion sine wave oscillator, dual state
variable tracking filters, mic preamp, and gated
peak/average level detection circuitry. A line level output is provided,
along with a balanced line input, and a direct powered microphone input.
Any of four locations can be selected for measurement, and external microphone
preamps can be supported with level calibration. The basic frequency
range of the system spans 10Hz to 100kHz and features a dynamic range
of 90dB equivalent to 16bit digital audio.
The high
resolution of the system allows up to 200 log-spaced frequency data points
to be taken per decade of frequency. This is equivalent to one data
point per pixel on the screen! One of the most powerful features
of LMS is the dual tracking filters. These filters allow many different
types of measurements to be made. The filters can be set for FLAT,
LowPass, HighPass, BandPass, and BandReject responses. The accuracy
and flexibility of the LMS analyzer rivals systems costing many times
more, and is certainly far easier to setup and operate for both novice
and experienced users alike. |
| Physical |
| Format |
Full Length
ISA 8-bit PC slot card |
| ISA
Bus Speed |
8MHz-16MHz |
| PC
card Size |
13.2 x 4.2
inches |
| Connector
Interface |
DB-15 Female |
| Power
Requirements |
| DC
Voltages |
+12V, -12V,
+5V, -5V |
| DC
Currents |
200mA, 200mA,
230mA, 100mA |
| Microphone
Supply |
+9.0Vdc @
50mA Max (LVP Interface) |
| Power
Consumption |
7 Watts |
| Oscillator |
| Frequency
Range |
Programmable;
10Hz-100KHz |
| Sweep
Range |
10Hz to
100kHz - 4 Decades |
| Sweep
Scale |
Logarithmic |
| Frequency
Resolution |
200 Points
per Decade, 1% Accuracy |
| Output
Impedance |
500 Ohms |
| Distortion |
0.015%, 20Hz-20KHz |
| Amplitude
Flatness |
±0.1dB |
| Max
Output Level |
+16dBm (5Vrms) |
| Attenuator
Step Size |
0.25 dB |
| Attenuator
Range |
0 to -60
dB |
| Gating
Resolution |
0.1mS, Zero
Crossing Sync |
| Gating
Time Range |
0.1mS to
6 Seconds |
| State
Variable Filters |
| Filter
Complement |
2- 2nd Order
Tracking Programmable Filters |
| Filter
Functions |
Flat, 2nd
Order: LP, HP, BP, BR |
| Frequency
Range |
Programmable;
10Hz-100KHz |
| Oscillator
Tracking Ratio |
Any Ratio
from 0.1:1 to 10:1 |
| Tracking
Flatness |
±0.25 dB |
| Q
Factor HP, LP, BP |
1.0 |
| BR
Notch Depth |
40dB Typical |
| Analyzer |
| Measurement
Range |
+20dBm to
-70; 90dB Dynamic Range |
| Detection
Methods |
RMS Scaled
Average, Gated Peak |
| Measurement
Types |
Precision
Settling, and Hi-speed single sample |
| Gating
Resolution |
0.1mS |
| Gating
Time Range |
0.1mS to
6 Seconds |
| Balanced
Line input |
| Input
Impedance |
100K Ohms |
| Freq
Response |
-0.5dB 10Hz-100KHz |
| Balanced
Input CMR |
40dB 20Hz-20KHz |
| Maximum
Input |
+20dBm |
| M31
Microphone |
| Construction
Type |
Condenser
Electret Element |
| Internal
Preamp |
Direct Powered
Hybrid Preamp/Buffer |
| Accuracy |
±5dB uncal;
±1dB cal; 10Hz-40KHz |
| Maximum
Level |
125dB-SPL |
| Dimensions |
8mm/0.351In
diameter, 100mm/4.00In long |
| Finish
& Termination |
Black Anodized
Aluminum, 3 Pin XLR |
|
