External Dc Power Supply - Larson Davis SoundAdvisor 831C Reference Manual

Pin # Description
15 Vwthr1, Analog to Digital
Converter Input, Wind
Direction
16 Vwthr2, Analog to Digital
Converter Input,
Temperature
17 Vwthr3, Analog to Digital
Converter Input, Humidity
18 Analog Ground, Signal
ground for pins 15 through
17
1. To enable the "Logic In, Logic Control Input" fea-
ture, when making your own cable, pin 12 (Mains
Power Status) must be driven by a resistance
lower than about 20k

necting a 10k resistor from pin 12 to either pin
13 (+2.5V, to simulate running on Mains power) or
to pin 1 or 5 (Ground, to indicate running on
external battery power). Pin 4 needs to be driven
high to assert the Logic In and pulled low to de-
assert the input. It should not be left floating.
This can be done with a momentary push-button
switch from pin 4 to pin 13 with a 10k
resistor to ground (10k
Battery
Size: 4 x AA size cells (LR6)
Types: 1.5 V Alkaline, 1.2 V NiMH rechargeable, 1.5
V Photo–Lithium
Typical Operating Time: > 8 hours continuous
measurement
External Power
Via USB Client Connector: Powered by computer
or PSA029 Power Adapter, 5.0 ±0.5 V typical, 16 V
absolute maximum

External DC Power Supply

Provides power to operate instrument, supply USB
Host port with 500mA, and charge batteries
Recommended Supplies: Use cable CBL140 with
PSA027, CBL154 for 426A12, or Model 831-INT
Interface with Mains and battery supplies
Voltage: +10 to +25 V
Supply Current Requirement: 1.0 A minimum
Power Consumption: 1.1 W (display off, running,
no USB Host devices, not charging)
2 W (display & backlight on, no USB Host devices,
not charging)
< 5.4 W (with 2.5 W USB Host power and charging)
Accessory Power Consumption: 831-MEM32G
USB Memory, 32GB: +0.6 W
DVX012 Ethernet Adaptor: +1.8 W
SoundAdvisor Model 831C
Signal Type
Input, 0 to +2.048 V,
100k  load, scale
with series resistor
Ground

. This may be done by con-

pull down

from pin 4 to pin 1 or 5).
DVX014 WiFi Adapter: +0.7 W
Table A.2 Low Power At Boot-Up
Power Power
Parameters
Level Source
External < External
Shutoff
Voltage
+ 0.8 V
Internal < 4.2 V
External < External
Shutoff
Voltage
+ 0.5 V
Internal < 4.1 V
External < External
Shutoff
Voltage
- 0.2 V
Internal < 3.8 V
1. The External Shutoff Voltage is a user defined set-
ting, see 9.5.7 "External Shutoff Voltage" on page
9-5
2. The boot up process halts for one minute, if power
is not restored within one minute, then the meter
will shut off for a period of time before powering
back on. When the meter powers back on is deter-
mined by the number of times trying to boot with
failed power, see Table A.3.
Table A.3 Power On After External Power
Fail Schedule
Powers On
1st Attempt
2nd Attempt
3rd Attempt
4th Attempt
5th Attempt
Icon Action
Warning
Only
1
Halts
boot-up
process
Halts
boot-up
process
and
shuts
down.
N/A Aborts
boot-up
and
shuts
down.
N/A
Time Since Last
Power Fail
20 minutes
1 hour
2 hours
4 hours
6 hours
2
A-4