Author Topic: 898 voltage offset  (Read 3457 times)

0 Members and 1 Guest are viewing this topic.

Offline tambrose76

  • Jr. Member
  • **
  • Joined: Apr 2011
  • Location: NORTHERN, WI
  • Posts: 34
  • USMC Ret.
  • Unit(s): 898c, 737, WIDE ONE, SUPERTRAP30, PORTAB
  • Software: ALWAYS UPDATED
  • Accessories: GPS16 WXSENSE
898 voltage offset
« on: August 26, 2017, 04:32:39 PM »
Using a calibrated voltmeter, the feed to my 898 reads 1.6vdc higher than what the HB display says.  This reveals my main battery to maintain 12.2vdc after an 8hr rest and no other electronics to bleed it down. New battery, Guest algorithm charger on AGM setting, wiring intact, electronics technician. Why would the display read lower than the input voltage. Also, I see the Low Voltage alarm comes on during engine start, noting the current draw and resultant voltage drop to bark.  Why not a measurement of the last ten seconds (averaged) to preclude alarming but for the display voltage during fishing use?
"Some men see things as they are and say why.
I dream things that never were and say why not." --George Bernard Shaw


Offline Bob B

  • Hero Member
  • *****
  • Joined: Oct 2010
  • Location: Creve Coeur, Il
  • Posts: 1568
  • Unit(s): 1197c si, 1198c si
  • Software: 6.310, 6.490
Re: 898 voltage offset
« Reply #1 on: August 26, 2017, 09:11:06 PM »
How are you checking the voltage ..... If you remove the cable collector on the 898 there are pins on the power cable that can be accessed from outside the connector.  Check the voltage there with the unit powered on.

There is no calibration for the voltage reading.
**Looking for the one that makes it all worthwhile**

Offline tambrose76

  • Jr. Member
  • **
  • Joined: Apr 2011
  • Location: NORTHERN, WI
  • Posts: 34
  • USMC Ret.
  • Unit(s): 898c, 737, WIDE ONE, SUPERTRAP30, PORTAB
  • Software: ALWAYS UPDATED
  • Accessories: GPS16 WXSENSE
Re: 898 voltage offset
« Reply #2 on: August 28, 2017, 04:16:17 PM »
The voltage at the pins, battery, bus bar are identically high compared to the display.
"Some men see things as they are and say why.
I dream things that never were and say why not." --George Bernard Shaw

Offline Gimp

  • Jr. Member
  • **
  • Joined: Apr 2013
  • Location: Northern, WI
  • Posts: 82
  • Unit(s): 998 HD SI
  • Accessories: i-Pilot Link
Re: 898 voltage offset
« Reply #3 on: August 28, 2017, 04:47:10 PM »
The voltage at the pins, battery, bus bar are identically high compared to the display.
The problem is you need to measure the voltage at the pins WHILE the battery is under load (i.e. while the unit and everything else that is connected to the battery is ON) The hard part is getting the volt meter onto the pins while the unit is on.

A battery under load will read lower that at idle. The more 'worn out' the battery is, the more the two measurements will differ.

Offline rnvinc

  • Hero Member
  • *****
  • Joined: Nov 2009
  • Location: Western KY
  • Posts: 4329
  • Unit(s): 1197c SI Combo, SOLIX G2 MSI
  • Software: Dependent on whim
  • Accessories: AS GRHA, MEGA 360, LowBird LSS 1 & 2
Re: 898 voltage offset
« Reply #4 on: August 28, 2017, 10:01:22 PM »
Turn the backlight the down to 1 and the readout voltage will be closer to your volt meter reading  ...

Rickie


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo

 

Related Topics

  Subject / Started by Replies Last post
1 Replies
2944 Views
Last post November 01, 2009, 02:41:11 AM
by RGecy
2 Replies
3610 Views
Last post March 03, 2011, 06:43:47 AM
by stillbear
11 Replies
6826 Views
Last post February 06, 2012, 06:28:07 PM
by stillbear
2 Replies
3241 Views
Last post April 04, 2017, 06:34:25 AM
by LGF
4 Replies
3841 Views
Last post October 11, 2013, 06:43:25 PM
by slabbacks
5 Replies
5771 Views
Last post April 09, 2014, 06:47:11 AM
by bobcoy
0 Replies
2708 Views
Last post July 01, 2014, 06:25:06 PM
by Bob B
Offset Speed

Started by Fay 798c SI

5 Replies
4037 Views
Last post October 25, 2014, 08:53:41 AM
by Fay


anything
SimplePortal 2.3.3 © 2008-2010, SimplePortal